<body>
    <form action="/test/checkCaptcha" method="post">
        <input type="text" name="captcha" placeholder="验证码"><br>
        <img src="{{ captcha_src() }}"><br>
        {{csrf_field()}}
        <input type="submit" value="提交">
    </form>

    @if(count($errors)>0)
    <div class="alert alert-danger">
        <ul>
            @foreach ($errors -> all() as $error)
            <li>{{ $error }}</li>
            @endforeach
        </ul>
    </div>
    @endif
</body>